2003 Jeep Grand Cherokee Limited Logo
Heraclito Brito Posted on Nov 19, 2013
Answered by a Fixya Expert

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Error p1784 My jeep grand Cherokee is having this error.

1 Answer

Frank Engelgeer

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  • Jeep Expert 165 Answers
  • Posted on May 28, 2014
Frank Engelgeer
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This code is for the LR pressure switch sens circuit. The switch is part of the TRS/solenoid block inside the transmission. (I presume at least that you have the 5-45RFE transmission with the 4.7L). The problem could be wiring or TCM, but mostly its the pressure switch itself and need a new solenoid assy.

5 Related Answers

AzVip

  • 114 Answers
  • Posted on Mar 26, 2009

SOURCE: 2002 wj jeep grand cherokee p1756

The governor pressure sensor is the most likley cause however an inspection of fluid or debris in trans pan would be a good idea to make sure there's nothing excessive in it. Attached is a list of possible causes however the senor would be the most common.

POSSIBLE CAUSES

  • Powertrain control module
  • 5 volt supply circuit open
  • Check transmission fluid level and condition
  • GOV press sensor signal circuit shorted to voltage
  • GOV press sensor signal circuit shorted to sensor ground
  • GOV press sensor signal circuit shorted to ground
  • GOV pressure sensor signal circuit open
  • Sensor ground circuit open
  • GOV press sensor signal circuit shorted to voltage inside transmission
  • 5 volt supply circuit open inside transmission
  • Intermittent governor pressure solenoid
  • Internal transmission problem
  • Oil burnt or oil pan has excessive debris
  • Other transmission DTC'S
  • GOV press sensor signal circuit shorted to sensor ground inside transmission
  • Valve body
  • GOV press sensor signal circuit shorted to ground inside transmission
  • GOV press sensor signal circuit open inside transmission
  • GOV press sensor ground circuit open inside transmission
  • Governor pressure sensor (high)

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Anonymous

  • 147 Answers
  • Posted on May 08, 2009

SOURCE: Radiator fan will not turn off in my 2000 Jeep Grand Cherokee

usually the engine relay or cooling fan relay..!

Anonymous

  • 12 Answers
  • Posted on Jun 05, 2009

SOURCE: overhead console completely dead 2002 jeep grand cherokee laradeo

Check the fuses for the overhead console, could be that if not then the console needs to be replaced.....

Anonymous

  • 5081 Answers
  • Posted on Oct 11, 2009

SOURCE: shift indicator light 1999 Jeep Grand Cherokee

There are two parts to it, a voltage resistor, and the EL panel itself.

You need to remove the console first. There are 2 screws under the front rubber pad, two under the cup holder, two in the bin. Remove those six first, take the storage bin out, then slide the rear cupholder out, remove the two screws under the cup holder, and one in front of it.

There are a total of 6 flat screws, and 3 self tapping screws you have removed.

Put the parking brake on, shift the tranny to N, and the transfer case to the middle position if equipped.

Remove the entire console. Slide the shifter beezel as far up vertically as you can. There are 4 clips you ned to remove to do it.
You will see a blue and black wire running into the back. Follow those wires to the resistor. You will see a transparent EL panel attatched to the resistor by two clips.

Usually, one or both of these clips has come loose, causing the light to work intermittantly. Clip them back on, and turn on the headlights to confirm that the light works correctly now.

Re-install everything in the opposite order.

Anonymous

  • 3640 Answers
  • Posted on Jan 21, 2010

SOURCE: 2002 jeep grand cherokee with 4.0 engine will die but restart

p0340 is the cam shaft sensor, this will cause it to cut off while driving, hardtime starting, p0351 is the ignition coil A primary/secondary curcuit mal function. p1391 is ignition system misfire, this could be plugs, wires, or coils. first of all have the cam sensor changed and it may correct the rest of the codes. when fixed turn light off with obd2 scanner. if you do not have one, then any auto parts store will erase the codes fo free of charge.

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What this code is p-1784

P1784-LR PRESSURE SWITCH SENSE CIRCUIT
This is a transmission fault code. Diagnosing it will require the DRB3 scan tool, or equivalent aftermarket scanner, and the transmission simulator tool.
---------------
Remove the VB(valve body) and the solenoid pack is easy to change and a shift kit comes with a non stick switch valve.In most of the cases is faulty solenoid pack causing this eror code.But there are other possibilities to.
P1784-LR PRESSURE SWITCH SENSE CIRCUIT

When Monitored and Set Condition:
P1784-LR PRESSURE SWITCH SENSE CIRCUIT

When Monitored: Whenever the engine is running.

Set Condition: The appropriate code is set if one of the pressure switches are open or closed at the wrong time in a given gear.

POSSIBLE CAUSES
LOSS OF PRIME P1791 PRESENT.
RELATED RELAY DTC
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1999 grand cherokee engine starts butwill not move in any of the gear selections. Scanned with autoenginuity scantool shows dtc codes p1767 and p1784

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Start by checking fluid level and condition. then check electrical connections. if all ok, probably solenoid in the valve body assembly.

P1767 Transmission Relay Always On. Transmission Range Sensor Circuit Malfunction (PRNDL Input)

Start with the simple and Check your fuses and transmission fluid level, if the level is good and the condition of the fluid is good. There may be an issue with your solenoid or your transmission pump. You can check your pump buy checking your transmission fluid level with the engine not running and take note where the level is. Then start the engine and check the fluid level again, if the level has gone down. The your pump is good, if it does not go down. Then your pump has gone bad and your going to have to rebuilt the transmission or replace the pump.

You better of replacing the whole transmission of the pump has gone bad, since the low transmission fluid pressure would have worn out most for your clutches throughout the transmission.

Thank you for using Fixya and hope is just a simple Solenoid that has gone bad or a wire harness that has shorted out.
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